Apparatus for reversing the motion of screw-taps



. section through the apparatus.

` tionl througha-dielholder andthe". f Inlthe manufacture of shorts-crews' A of thesmallerclass `inthe t'orjmer are, with the 'exceptionof wcodscrewsmsnailycutnr tiire'arri ed by dies embracing the screw and rotating and advancing as they out.

'UNITED STATES PATENT OFFICE..

A LINUSYJYALE, '.JR., OFSHELBURNE FALLS, MASSACHUSETTS.,

APPARATUS FORREVERSING THE MOTION oF SCREW-TAPS.

Specification forniing'part of LettersPatent No. 48,476, dated .Tune 27, i865.

? To all whom it may concern'.-

Be it known that i, LINUS YALE, Jr., of sheiburne Falls, in the county of -Franklin andV Stateiof Massachusetts, have invented certain new and useful apparatus applicable to the threadingofscrews and tapping of nuts speedily and efficiently; and` I do hereby `declare 'that thefollowing, taken inconnection with the drawings, is a full, clear, and exact description thereof.

and nuts- The latter are tappedout .by1 taps enteringinto and. retreat- `ing out of aihole punched or drilled inthe nut-A blank.

My improvement relates to thisplan of inaking screws and nuts, and enables a' workman,

' by the mere act of exerting pressure in different directions, .to cause eithera tap or die to rotate in diierent directions, so as to traverse a screw-thread alternately from oneendtc the other, and then back` again.

In the'drawin gs, ahead-block isrepresented at'A. This head-block may be made fast to a table' orV stand, or, as I prefer-,be providedwith a hole, a, b y means of ywhichitinaybeniounted upon' a lathe-bar. Inl this head-blockis firmly secureda sleeve, B, and upon this sleeve are-V mounted two pulleys, D. D', so fitted as to turn reasily on the sleeve, andbein g prevented from moving longitudinally thereon by collars F F, or any other contrivance lsuitable furthe pury pose., The ends ot these pulleys, "at the outer ends of the sleeve, have a conical recessformed -in them, as'clearly indicated in thedrawings. Alive-spindle, G,is passed through ythe tube or sleeve, and upon each end of itare screwed,

'eyed, or otherwise securedtwo disks,rE'E, whose inside surfaces are formed into counter-- parts of the conical recesses in the ends of the pulleys. The disks and recessed ends of the I two-'pulleys constitute two friction-clutches,

and thedistancebetween thecones on thedisks bears such relation to the distance between the parts of one clu-tch arein contact thepfarts ot the other are out ofvcontact, and-vice versa. The pulleys vl) D are to be kept in revolution `in opposite directions during the operation of the lmachine by two belts, which may'bedriven beingcrossed. A tap holder, M', may besedisks. If a nut-blank be vnow secured to theV standard G, mounted on .a lathc'bar, and ad.- vanced toward and into contact with the tap,

with'andrevolve with the p ulleyD,-whi`ch should -enter-theniflrandlcoimnence ath read.. When the tap has entered far enough the'nutisto be will be drawn'away from D, when the spindle and tap will cease to revolve, and E" will then be brought into contact with D', causing the spindle and tapf to revolve in the opposite direction, and thus to .retreat out of the nuts. By a succession 'of such operations the nut hollow, and the nut-blank securedso .as -to remay beattached to the' standard G.

the die-head conicahas at P, sothat it becomes `both (lie-heini and part of a clutch, and Vto attach the die-head to the spindle; but it may be "secured -toone ofl thejdisks, or v,the screw-blanks maybesecured to either the spina that case must not revolve.

which the dies J are mounted on .carriages pr late upon spindles 'I'. making 'part of on atwhich the Idies can vibrate .is regulated'by stops'M,v attached to the head, -and'set-screws of mounting the carriages the d-ies actually be; come chasin g-tools, and their cutting-edges are their counterparts on the` pulleys-that when.

'die or' one of the disks, and the diep-head in tached to the' carriages, and thearc through from pulleys on a counter-shatt,one of thebelts 4 cured either to the live-'spindle or oneor the thepressurewill slide the spindle anddisks v endwise, causing the disk E to come incontact yrotate in such direction as to cause the tap to `drawn away from the tap; In doing this E I l can be tapped. Thelive-spindle may befinade Y volve with theJ spindle, in which case the tap4 i 1n cutting screws l prefer to form one end of A lathe-drawings I have vshown a diehead'in l' die-holdersan'd are advanced. to theirvvork 'l byscr'ews K. vThe carriages are free to oscil-l L, attached yto the holders- By. this method'V When screws are cut with this apparatus a force tendingto separate the screw and dies will cause the latter to revolve in' one direction, audaforee tending to make them approach will 'cause the die to revolven the oppositedrection, so that the die will traverserthescrew in both directions, with a-proper direction of ing or pulling the blank.

revolution vfor each traverse by merely push- Any sort of clutch may be ,substituted for the'one represented in the drawings so long as it is of such character that it will-bethrown in and outof contact by an endwise motion of a shaft or spindle, to which one part of the clutch is attached; but parts of both clutches v must be attached tothe same spindle, andthat spindlefmustbebcapable of moving endwise with res'pectto the pulleys,

AI claim as cfm-y owninventiou in the hereyill-described contritfanbcer for.' making` screws and nuts-' The combination otftwo recessed pulleyswithtwo corresponding disks to clutch therewith,lv and a' liyelspin'dle to,whehthe latter are attached,l arranged substantially as described, so that. the spindle caff be clutched to'either pulley andflnadeftorotate in accordance with the motions thereofby a force employed to push or topuil sadspindle longitudinally in either-direction, substantially as described.

In testimony whereof I have hereunto subscribed my'nai'ne.

p LINUsJYA-Ln, Ja 'In presence ol- ARTHUR MAXWELL' HENRY WINN.4 

